Printing-press.



W. S. WARNOCK.

' PRINTING PRESS.

APPLICATION FILED MAY B, 19!]. RENEWED APR. 1.1912.

1353,57. PatentedSept. 14, 1915.

7 SHEETS-SHEET I.

w. s. WARNOCKI PRINTING PRESS.

APPLICATION FILED MAY 3. 19]- RENEWED APR. 1,1912. 1,153,587.

660? Mfr/"M005 Patented Sept. 14, 1915.

7 SHEETSSHEET 2 Mai/a W18. WARNOCK.

PRINTING PRESS.

APPLICATION FILED MAY 8, 1911. RENEWED APR. 1.1912.

Patented Sept. 14, 1915.

I SHEETS-SHEET 3.

& .X

Ill/il/IIIII/I/ 1 KQW 1lll W. S. WARNOCK.

PRINTING PRESS.

APPLICAHON FILED MAY 8, I911- RENEWED APR. 1.19l2- Patented Sept. 14, 1915.

7 SHEETS-SHEET 4.

W. S. WARNOCK. PRINTING PRESS.

APPLICATION FILED MAY 8, 19H. RENEWED APR. 1,1912.

1,153,587. Patented Sept. 14; 1915.

1 SHEETSSHEET 5a W. S. WARNOCK.

PRINTING PRESS.

APPLICATION FILED MAY 8. I91]. RENEWED APR. 1.1912.

Patented Sept. 14, 1915.

7 SHEETS-SHEEI 6.

W. S. WARNOCK.

PRINTING PRESS.

APPLICATION FILED MAY 8. 19!]. RENEWED APR. 1,1912. 1,153,587.

k WWW M W. g 7% g E E y dw b m1w Q M 2 Q Q? Nag 9% v Q N f k? RY WALLACE S. WARNOGK, EVANS'ION, ILLINOIS.

PRINTING-PRESS.

incense.

Specification of Letters Patent.

Patented Sept. 14, 1915.

Application filed May 8, 1911, Serial No. 625,815. Renewed April 1, 1912. Serial No. 687,779.

To an whom it may concern:

Be it known that I, WALLACE S. WAR-1 NOCK, citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Printing- Presses, of which the following is a full,

clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to printing presses employing tympan cylinders and printing cylinders and is of importance in connection with various presses of this general character whether or not the printing cylinders carry made up forms or are otherwise provided with the means by which printed impressions are made. v

My invention finds its most important utility in connection with that class of printingv presses in which is embraced a printing press having a tympan cylinder and a plurality of prmtingpylinders, say two.

In accordance with the preferred embodiment of my'invention, the tympan cylinder is of a size which will support two sheets to be printed upon each by. a printing cylinder individually and the mechanism of the press "is preferably such that both printing cylinders may be maintained in printing relation with the tympan cylinder in order that each sheet may be printed upon by both printing cylinders, in'order, for example to provide multicolored impressions upon each sheet, one printing cylinder serving to apply one color to each sheet and the other printing cylinder serving toapply another color to each sheet. Mechanism is also provided whereby each printing cylinder may intermittently be brought into printing relation with that area of the tympan'cylinder individual thereto and whereby the printing cylinders are alternately brought into printing relation with the tympan cylinder, one printing cylinder into printing relation with that part of the tympan cylinder to which it is individual, and the other printing cylinder into printing relation with the other part of the tympan cylinder.

In accordance with a very important feature of my invention I provide means whereby the printing cylinders, when in printing relation with the tympan cylinder, are simultaneously moved from the tympan cylinder in the event of a misfeed or of some other reason requiring the dissociation of the printing cylinders from the tympan cylinder. In the event of a misfeed the printing cylinders are thus prevented from printing directly upon the tympan cylinder. The

printing press also includes mechanism whereby the printing cylinders, when arranged for alternate relation with the tympan cylinder, are individually and selectively removable from printing relation with the tympan cylinder.

A printing press constructed in accordance with the preferred embodiment of my invention is shown in the accompanying drawings in which so I they are normally in printlng relation with the tympan cylinder, out of printing relation with the tympan cylinder; Fig. 7 is a plan view, partially in section, illustrating the mechanism shown in Fig. 6 and some additional mechanism; Fig. 8is a view in elevation, partially in section, of a part of the mechanism which enters into the control of the printing relation-of one of the printing cylinders with the tympan cylinder; Fig. 9 is a view in sectional elevation'on line 99 of Fig.8; Fig. 10 is a plan view, somewhat diagrammatic, illustrating some of the mecha nism that enters into the control of the printing relation between the printing cylinders and the tympan cylinder; Fig. 11 is a view in elevation of certain of the mechanism illustrated in Fig. 10, certain structural parts of the press being removed in order to render the illustrationclear; and Fig. 12 is a view, somewhat diagrammatic, that illustrates the main power connections.

Like parts are indicated by similar characters of reference throughout the different figures.

The tympan cylinder 1 is provided with a spurgear wheel 2 upon an end or ends thereof and coaxial therewith. This spur gear wheel is in constant mesh with a driving pinion 3 that ,is fixed upon the main driving shaft suitably driven as by means of a belt and pulley. This pinion 3 is in constant mesh with another pinion 4 that in turn is in driving connection with a spur gear Wheel 5 for purposes hereinafter to be setv forth. As illustrated, the press is'hand fed, to which method of feeding I do not limit myself however. 'One feeder stands upon one side of the press to feed the sheets to be printed to the tympan cylinder from I the inclined feed board 6 and the other feeder stands upon the other side of the press to feed the sheets to be printed upon down the inclined feed board 7 The tympan cylinder is provided with two sets of gripping devices 8 and 9, the gripping devices 8 operating to grip the sheets fed from the feed board 6 and the gripping devices 9 operating to grip the sheets fed-from the feed board 7. The mechanism by which the grippers operate is so well lmown to those skilled in'the art as to require no description or further illustration. The sheets gripped by the grippers 8 lie upon one section of the tympan cylinder which is appropriated thereto and the sheets gripped by the grippers 9 lie upon another and distinct part of the tympan cylinder appropriated to these latter sheets. When the printing cylinders 10 and 11 are adjusted to be alternately brought into and out of printing relation with the tympan cylinder, the printing cylinder 10 operates solely to print impressions upon the sheets held by the grippers 8 and the printing cylinder 11 operates solely to print upon the sheets held by the grippers 9, the mechanism of the press operating to permit the sheets printed upon by the printing cylinder 11 to pass between a gap for the purpose temporarily established between the printing cylinder 10 and the tympan cylinder. With the adjustment of the press that is being described, the sheets that are fed upon the tympan cylinder for the purpose of being printed upon by the printing cylinder 10 are passed through a gap temporarily established for the purpose between the printing cylinder 11 and the tympan cylinder. The printing cylinders are provided with spur gears 12 fixed with respect thereto and in constant mesh with the spur gear 2 when said cylinders are in or out of printing relation with the tympan cylinder, whereby the forms upon the printing cylinders are in fixed operating relation with respect to the tympan cylinder. With the printing press adjusted to operate as just described, each printing cylinder prints upon the sheet fed from one feed board only. By another adjustment of the mechanism of the press, both printing cylinders aremaintained, during the normal operation of the press, in constant printing relation with the tympan cylinder so that each printing cylinder prints upon the sheets fed from both feed boards. When the press is thus adnusper justed to operate, one printing cylinder may print upon one part of each sheet and the other printing cylinder may print upon another part of each sheet, thus adapting the press to two color printing'when ink of one color is supplied to the form carried by one printing cylinder and ink of another color is supplied to the form carried by the other printing cylinder.

The ink is applied to the printing cylinders by inking mechanism which I have not seen fit to illustrate as such is well known by those skilled inthe art, and while the ink is preferably directly transferred to the sheets from the printing cylinders as they lay upon the tympan cylinder, I do not desire to be limited to this characteristic.

The printing cylinders are provided with journal boxes 13 that are bodily movable within guides 14. whose guiding sides are parallel with radii of the tympan cylinder that pass through the axes of rotation of the printing cylinders so that the printing.

cylinders may be adjusted toward and from the tympan cylinder without exerting disturbing torque upon the spur gear 2. These journal boxes 13 are desirably moved in their guides 14 for the purpose which has been described and for the purpose of arbitrarily separating the printing cylinders from printing relation with the tympan cylinder by means of cam mechanism that includes each a shaft 15 having a fixed axis of rotation and carrying a disk 16 that constitutes a cam by being mounted upon the shaft 15 eccentric thereto. The eccentric 16 bears upon an eccentric seat in a block 17 carried upon the lower part of each journal box. When the printing cylinders are both simultaneously to be maintained in printing relation with the tympan cylinder, no move-- ment of the journal boxes 13 occurs except when the printing cylinders are to be arbitrarily dropped or moved out of printing relation with the tympan cylinder. In this latter event, and also when the printing cylinders are alternately to be brought into and out of printing relation with the tympan cylinder, the shafts 15 are turned through arcs of circles sufficient to cause the required movement of the printing cylinders with respect to the tympan cylinder. The printing cylinders are moved ositively toward the tympan cylinder t e eccentrics 16 and are permitted to fall away from the tympan cylinderby the action of gravity when said eccentrics are suitably positioned.

An arm 17 projects from and is rigidly secured at one end to each shaft 15, and each arm 17 is connected at its free end with the upper end of a link 18 whose lower end has pivotal connectionwith one end of an arm 19 that is rigidly connected at its other specifically described mechanisms for adn justing both printing cylinders that are similar. I have shown in detail the mechanism that is employed for adjusting the right hand printing cylinder as it appears in Fig. 3, it being understood that similar but symmetrically disposed mechanism is employed for adjusting the companion printing cylinder. A description of the mechanism given in connection with one printing cylinder is understood to apply to the mechanism that is employed for adjustingthe other printing cylinder and similar parts are given similar characters of reference. The spur pinion 20 associated with each printing cylinder is connected with a rack 21. In the further description of the adjusting mechanism reference will be had particularly to Figs. 3, 8 and 9.

Each rack 21 is at one end ofa bar or rack extension 22 that is receivable within a 7 socket provided in the outer end of a re- .ciprocating cam follower 23, the rack bar 22 being normally held in fixed relation with the cam follower 23 by means of a pin 24 projecting downwardly from thetop side of the yoke 25 and entering registering recesses in the engaging ends of the cam follower and the rack bar extension. The cam follower is provided with a cam roller 25 that is adapted to enter within a cam groove 26 provided in aface of the constantly rotating cam 27 which is fixed with respect to and is co-axial with the gear 5. The cam roller 25 engages the cam groove 26 when the associate printing-cylinder is alternately to be brought into and out of printing relation with the tympan cylinder, the cam groove 26 having wall portions 27 that operate to bring the cam roller 25 into engagement with the wall portions 28 of the cam groove and which wall portions 28 are concentric with the axis of rotation of the cam whereby the rack bar 21 is caused to turn the pinion 20 a sufficient distance to swing the arm 19 downwardly to.

an extent that will cause the eccentric 16. to turn sufliciently to allow the associate printing cylinder to fall sufficiently away'from the tympan cylinder to break. the printing relation between these cylinders. The cam groove 26 is also provided-with wall portions 29 that direct the cam roller-25 into.v

The dwell 28 of the cam is of sufficient length to maintain the associate printing cylinder out of printing relation during a predetermined interval and the dwell 30 is of sufficient length to maintain the printing cylinder in printing relation with the tymval.

When both printing cylinders aresimultaneously to be maintained in printing relation with the tympan cylinder, engagement between the cam groove 26 and the cam roller 25 is broken and engagement is thereupon eflected between the roller 31 and a groove 32 (see particularly Fig. in a disk 33, this groove being concentrlc with the axis of rotation of the cam 27 and being located fixedly to hold the cam follower 23 in that position in which it is adapted temporarily to be held by the dwell 30, and 1n which fixed position of the cam follower 23, the associate printing cylinder is held in permanent printing relation with the tympan cylinder. This adjustment of the parts last mentioned is preferably accomplished by shifting the cam 27 and disk 33 by mechanism which will later be described.

When the printing relation between eitheror both of the printing cylinders and the tympan cylinder is to be broken, the connection between the cam follower 23 and the rack bar 21 is broken to remove the influence of the cam 27 or the disk 33, as the case may be, from the rack bar 21 to permit the associate eccentric 16 to be adjusted independently of said cam and disk. To this end I provide the base of the yoke 25 with a shoe 34: that rides upon a roller 35 mounted upon the free end of the. arm 36 which is ..rbitrarily moved by mechanism later to be described when printing relation between a printingcylinderor cylinders and the tym pan cylinder is to be arbitrarily broken. When the arm 36 is elevated at its free end the yoke 34 is elevated to withdraw the pin 24 from engagement with the recess in the neighboring end of the extension 22 of the rack bar whereby the free end of the cam follower 23 is permitted to move with respect tothe rack bar, the engaging ends of the cam follower and rack bar extension being in free sliding fit so as to enable the rack bar 21 to be unresponsive to the reciprocations of the cam follower. When the [normal relation ofthe associate printing cylinder and tympan cylinder is tobe restored, the free endof the arm 36 is permitted to descend whereupon the yoke will fall mainly by the action of gravity, a spring 37 being employed if desired to assist in the descent of the yoke. The yoke, of

course, will not falluntil the pin 24 has been brought into register with the recess in the neighboring end of the extension 22 of the rack bar whereby the cam follower 23 is again brought into control of the associate printinw cylinder. 1

I wil now describe themechanism by which the arm 36 is arbitrarily adjusted for the purpose which has just been described when the printing cylinders are al-- ternately brought into and out of printing relation with the tympan cylinder in the normal operation of the press. The mechanism which I prefer to employ includes an arm 37 fixed upon the shaft 36 to which the inner end of the arm 36 is also fixed.

I helical cam 41, the elements 40 and 41 being I adapted freely to rotate upon and with respect to the shaft 38. The helical cam 41 engages a groove in the periphery of a cam disk 42 having a cylindrical extension 43 that is adapted freely to slide back and forth in a contiguousend OI the arm 37. The arm 40 is operated by manually controlled lever mechanism later more fully to be described, and of which the rod 44 forms a part. When this rod is moved upwardly torque is exerted upon the end of the spring 39 connected with the arm 40. and if the cam disk 42 is free to be moved, power will be transmitted through the coil spring 39 to .the cam 41 to turn this cam which effects the movement of the cam disk 42 in a direc .tion to bring the extensionor pin 43 into the plane of a cam disk 45. This disk 45 has its periphery so shaped that it will so operate upon the pin 43 as to swing the arm 37 and cause this arm to turn the shaft 36 The arm 36 fixed upon the shaft 36 and which is preferably duplicated, is thus caused to elevate the roller 25 for the purpose which has been described. If the arm 37 is untimely operated, the pin 43 will encounter a face of the disk '45 whereupon the spring 39 will be wound, this spring unwinding when clear space above the disk 45 is presented to the pin 43. One roller 35 is to be elevated when'the' printing relation of the associated printing cylinder is to be I broken and the other roller 35 is to be ele vated when the printing relation of the rinting cylinder associated therewith is to e broken, operating mechanism individual to each of these rollers being employed for this purpose, and entering into service when a the printing cylinders are adapted for alternate printing relation with the tympan cylinder. When both printing cylinders are normally in printing relation with the tympan cylinder, both rollers 35' are to be simultaneously elevated when such printing relation is to be broken and for this purpose another arbitrarily controlled mechanism is brought into play, this latter mechanism also preferably serving to hold the printing cylinders out of printing relation when they are normally alternately brought into printin relation.

will first describe the lever mechanism individually associated with each printing cylinder. This individual mechanism includes the rod 44, a bell crank lever 46, a rod 47 (Fig. 11), an arm 48' to whose upper end the rod 47 is swingingly connected, a rod 49, a bell crank lever 50 pivotally mounted at its elbow and fixedly connected with the rod 49 that constitutes this pivotal mounting, the link 51 attached to the lower free end of the bell crank lever, and the arm 52 to which a treadle 53 is secured. A spring 53 operates to restore the treadle and parts connected therewith to normal position when the treadle is relieved of foot pressure. By depressing the treadle 53, the rod 44 is raised to lower the helical cam 41 with the results which have been described, power applied to the treadle 53 being communicated to the rod 44 through the connections that have been described as inte in between the rod 44 and said treadle. As indicated in Figs. 10 and 11, parts of two arbitrarily controlled mechanisms are illustrated, one for each printing cylinder, and

similar parts of each of these mechanisms are given similar characters of reference.

I will now describe the mechanism common to both printing cylinders for brealn'ng the printing relation therebetween and the tympan cylinder in one operation, this mechanism also being illustrated in Fig. 10. This mechanism, while common to 'both printing cylinders, includes controlling mechanism upon each side of the press, each controlling mechanism including a treadlethe bore of a guide 61 provided at the upper end of the bell crank 50 whereby the treadle 53 may be depressed without operating the rod 60 since the guide 61 is then freely moved along the contiguous end of said rod. The rod 60 is provided with an enlargement in the form of nuts 62 engaging one end of the guide 61 so-that when the treadle 54 is depressed, the rod 44 is raised just as though the treadle 53 were depressed and with the results which have been described when the printing cylinders are normally alternately brought into printing relation. WVhen the printing cylinders are normally simultaneously in printing relation with the tympan cylinder, the en.- gagement effected between the elements'62 and 61 has no consequence. The bell crank 58 is also connected with a rod 63 that in of the rod 69, the treadle 54 upon either turn is connected with the upper end of an arm. 64 whose lower end is fixedly endofan arm 67. The other end of this arm 67'is fixedly connected with an arm 68, the arms 67 and. 68 being pivotally mounted at their adjacent ends. The lower end of the arm 68 is connected with one end of a elements 54 to 68 inclusive and similarly designated-whereby the operation of either of theseduplicated mechanisms will be followed by the operation of the other mechanism with duplicated results. Bymeans :side of the press will cause the movement of the rods 63 outwardly from the central portion of the press. If the printing cylinders are normally brought alternately into I and out of printing relation with the tymaan' cylinder, such printing relation is broken through the agency of the element 60 as hitherto described. If the printing cylinders are not alternately brought into and out of printing relation but are normally in permanent printing relation with r the tympan cylinder then these printing cylinders have'their printing relation with the tympan cylinder broken through the agency -'of the arm 70 that is rigidly connected with one end of the arms 67 by a connecting shaft or rod 70 but before describing in detail the breakage of this latter printing relation, I will first describe the mechanism by which the two printing cylinders are simultaneously brought into printing relation with the tympan cylinder. This mechanism includes a hand lever 71, a rod 72, an oscillating link 73 joining the rod 72 with a rod 74, the rods 72 and 74 being each connected with the free end of an oscillating lever 75 Whose other end is in engagement with the groove 76. of a cam ele-' merit 77. When the hand lever 71 is moved to the left, see Fig. 1, the inner ends of the oscillating lever 75 are moved toward each other so that the clutch members 77 engaging these inner ends are moved part way toward companion clutch members 7 8, the clutch -members 77 in their movement causing the quill shafts 79 to which they are rigidly attached to move toward each other and carry with them the cams 27, disks 33 and cams 45, these cams and disks being rigidly mounted upon the quill shafts so as to rotate therewith, the quill shafts themselves being splined upon a shaft 80 in order that the cams 27 and 45 and the disks 33 movements the cam groove 26 is withdrawn from engagement with the cam rollers 25 and the rollers 31 are engaged with the annular grooves 32 that are concentric with the shaft 80, whereby the printing cylinders are normally constantly maintained in printing relation with the tympan cylinder as has hitherto been described. In this new adjustment of the parts the cam disks 45 are removed from operative relation with the pins 43 so that the treadles 53 no longer have control of the relationship between the printing and tympan cylinders. The

oscillating lever 73 is connected with arms 81 that are in operative connection with clutch members 82 so that when the lever 71 is swung toward the left from the position shown in Fig. 1, these clutch members 82 are engaged with their companions 83. When the clutch members 82 and 83 are engaged, the clutch members 83, normally loose upon the shafts 84, are coupled with the shaft owing to the splined connections of the clutch members 82 with said shafts.

Referring more particularly to Figs. 1, 6 and 7, each shaft 84 is in operative connection with the associate rack 85 when the clutch members 83 and 84 are connected, each clutch member 83 carrying a pinion 86 with which the rack is held in mesh by means of rollers 87. Each rack bar 85 is provided with an extension 88 that carries a cam roller 89 which moves in a cam groove 90 provided in a cam 91. Each cam 91 is in splined connection with the clutch member 78 and does not normally rotate owing to the fact that the clutch member 78 is free upon the shaft 80. The clutch members 77 are splined upon the shaft 80 and when they are moved into engagement with the clutch members 78, as will hereinafter be described, the clutch members 78 are rotated together with the cams 91. When the cams 91 are rotated, the rack bars 85 are reciprocated and when the rack bars 85 are reciprocated the shafts 84 are rotated, the clutch members 82 and 83 having previously been connected.

The movement of the lever 71 to the left prepares the mechanism particularly illustrated in Figs. 6 and 7, by the engagement of the clutch members 82 and 83, for the turning of the shafts 84 when the clutch members 77 and 78 are engaged and the clutch members 77 and 78 are engaged, by

.mechanism to be more fully described, when the printing cylinders that are now supposed to be normally in printing relation with the tympan cylinder are by one controlling operation to be moved in succession away from the tympan cylinder.

Before describing the mechanism by which the clutch members 77 and 78 are brought into engagement for the purpose of removing the printing cylinders from the tympan cylinder, it' may well be stated that the shafts 84, when turned as a consequence of the reciprocation of the racks 85, move the arms 19 in the manner which has beelrbere inbefore referred to to adjust the eccentrics 16 to permit the printing cylinders to fall away from the tympan cylinder by the action of gravity, the extent to which the printing cylinders fall away being desirably so limited that the teeth upon the spur gears 12 upon the ends of the printing cylinders do not fall out of mesh with the teeth upon the spur gear 2 carried by the tympan cylinder.

I will now describe the mechanism by which the clutch members 78 are moved toward the clutch members 77 and into engagement therewith when the printing cylinders are to have their printing relation with the tympan cylinder broken. This mechanism is controlled by either of the treadles 54 whose operative connections with the arms 68 were hitherto traced and which were hitherto described as also being in operative connection with arms 70. The upper end of each arm 70 is flexibly connected with one end of a rod 92 whose other end is in connection with the upper end of a swinging arm 93 in flexible connection with the upper end of a bell crank lever 95 pivoted at its elbow and carrying a cam roller 96 at its remaining end, the spring 97 exerting upward pressure upon the horizontal arm of the bell crank lever for the purpose of holding the cam roller 96 between the walls of a cam groove 98 provided upon the stem of the clutch member 78. When either treadle 54 is depressed the bell crank levers 95 are turned about their axes to depress the bell crank levers against the force of the springs 97 to remove the rollers 96 from the cam grooves 98. Each clutch member is backed by a spring 99 that is normally under compression and which is free to expand when the associate roller 96 is dropped out of the cam groove 98 in the manner described. The spring 99 when freed will move its associate clutch member 78 toward the companion clutch member 77 which was previously partially moved toward the clutch member 78 by thrusting the lever 71. to the left. Clutch members 77 and 78 are now engaged and the cam 91, splined to the clutch member 7 8, is now rotated so that the stem 88 of the rack bar 85 is moved longitudinally to operate said rack bar and cause the rotation of the shaft 84, it being understood that the mechanism is practically duplicated upon both sides of the press, the shafts 84 upon the opposite sides of the press thereupon turning to adjust the cams 16 to permit the printing cylinders to fall away from the tympan cylinder in the manner which has previously been described.

In the embodiment of the invention illus trated, each arm 93 is provided with a brake shoe 98 at its lower end with which the associate clutch member 77 is placed in alinement when thelever 71 has been shifted to the left. This brake shoe is moved into engagement with the periphery of the clutch member 77 when the rod 92 is moved so as to afford a fulcrum for the arm 93 at its lower end, in order to move the rod 94. Each arm 94 has lost motion connection with the associate arm 93 in order to reduce-the travel of the arm 93. In order to prevent the cam 91 from creeping I provide a spring pressed detent 100 that engages the notch properly placed in the periphery of the cam 91 with suflicient force to prevent the creeping of said cam but readily permitting the cam to rotate when the clutch member 78 is coupled with its companion 77.

When the printing cylinders are by a single controlling operation to be separated in succession from the tympan cylinder, the racks 21 should be disengaged from the followers 23, to which end I employ cam disks 45 in association with each printing cylinder traveling with the cams 91 and engaging the pins 43 carried upon the free ends of arms 37 When the cams 91 are rotated, the cams 45 are also rotated and the arms 37 are swung to turn the shafts 36 upon which the arms 37 are fixed, whereby the arms 36 are moved to raise the associate yokes 25 to disengage the rack bars 21 from the cam followers 23. It will be observed from Fig. 6 that the cam 91 is provided with a cam groove which corresponds in outline with the groove of the cam 27, shown in Fig. 8. Inasmuch as the printing cylinders 10 and 11 are alternately raised and lowered in the normal operation of the machine on one-color work, the cams 27 which effect this automatic movement of the printing cylinders are so splined on the shaft 80 that corresponding parts of the cam grooves of the two cams are separated by an angle of 90, as will be understood from Fig. 1. It follows, of course, that the clutches 77, which are rigid with the quill shafts or sleeves 79,

are likewise splined 90 apart on the shaft 80. Thus, the arrangement is such that when the machine is set for two-color work with both printing cylinders normally in constant engagement with the tympan cylinder, the cams 91 will, when either feeder trips the machine, thus permitting the clutches 78 to engage the clutches 77 and thus rotate the cams 91the cams 91 will, under such conditions, actuate the racks 85 in succession, thereby oscillating the shafts 84 and lowering the printing cylinders in succession to permit passage of the particular impression surface with respect to which a given feeder has control, the printing cylinders being restored, in turn, to the constant contact position after passage of the impression surface with respect to which both printing cylinders will skip,

vices, but the invention is not to be under-' stood as'limited to machines which are not equipped with automatic sheet-feeding devices. v

When the machine is set for'alternate engagement of the printing cylinders with the tympan cylinder, each feeder has control over one particular printing cylinder, which then co-acts always with one particular impression surface of the tympan cylinder.

It will be understood, of course, that one printing cylinder only might be equipped with a form or plate and maintained in printing position co-acting with both tympan surfaces; and thus two feeders might work to the same form, thereby securing a large output of single-color work, from a single form. In such case, the other printing cylinder might run idly, without a form thereon, and never contacting with the tympan cylinder.

Important advantages result from the use of two printing cylinders associated with a single tympan cylinder of twice the diameter of the printing cylinders and equipped with two diametrically-opposed impression surfaces. Such is the preferred arrangement.

When the machine is so set that the printing cylinders will alternately co-act with the tympan cylinder, two separate and distinct jobs may be printed on the press at the same time,'in one-color work. When the machine is thus set, the trip for one printing cylinder may be kept depressed, so that the sheets fed to the corresponding impression surface will not be printed, but will serve as slipsheets.

When the machine is set for constant contact of both printing cylinders (for twocolor work) both printing cylinders operate on both impression surfaces, thus producing superposed two-color work on all sheets fed through the press. If desired, however, one feeder may keep his trip depressed, so that that is, alternately clear, the impression surface over which that feeder has control; and thus slipsheeting may be done fortwo-color work. This feature of the machine is of great importance, when it is borne in mind that there is more tendency for the ink to transfer to the Jsuperposed sheets in two-color work. The invention possesses other important advantages, as will be understood by those skilled in the art.

The operating mechanism which includes the eccentrics 16 serves so to limit the movements of said eccentrics that the printing cylinders are not capable of dropping so far away from the tympan cylinder as to bring the gears 2 and 12 out of mesh, whereby the printing cylinders are maintained in proper relation to the tympan cylinder when out of action to permit the printing cylinders to be placed in proper printing relation with "the tympan cylinder when the print ing cylinders are to be brought into action.

There are thus present means for limiting the movements of the printing cylinders to prevent the operating gearing from becoming unmeshed. The printing cylinders are moved in directions that will prevent interference between the meshed gear teeth, that is, the printing cylinders in their bodily movements are not accompanied by violent peripheral thrusting movements of gear teeth that mesh with other gear teeth.

I have in a large measure described individual structures for governing the association and dissociation of the printing cylin ders with the tympan cylinder but, as illustrated clearly in Fig. l, the individual struc' tures are generally duplicated and wherever such is the case, similar parts are given similar characters of reference.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitation should be understood therefrom, but the appended claims should be construed as broadly as permissible in view of the prior art.

Claims 1. A printing'press including a tympan cylinder provided with a gear wheel for operating it that is co-axial therewith; a plurality of printing cylinders each provided with a gear wheel in mesh with the wheel upon the tympan cylinder, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; and mechanism for bringing the printing cylinders into and out of printing relation to the tympan cylinder and operating to enable the printing cylinders to shift in directions substantially co-incident with radii of the tympan cylinder, there being means for so limiting the withdrawal of the printing cylinders from the tympan cylinder as to prevent the gear wheels from becoming out of'mesh whereby the printing cylinders are maintained in proper relation to the tympan cylinder when out of action to permit the printing cylinders to be placed in proper printing relation with the tympan cylinder when the printing cylinders are to be brought into action.

2. A printing press including a tympan cylinder; a .plurality of printing cylinders,

gear

the tympan cylinder having one portion adapted for indiyidual printing relation with but one of tne printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; gearing for operating the cylinders at proper relative speeds; and mechanism whereby the printing cylinders 1 may be moved along substantially straight lines of travel in order to bring the printing cylinders into and out of printing relation with the tympan cylinder, there being means for limiting the movements of the printing cylinders to prevent the operating gearing from becoming unmeshed.

3. A- printing press including a tympan cylinder provided with a gear wheel for opcrating it that is co-axial therewith; a plurality of printing cylinders each provided with .a gear wheel in mesh with the gear wheel upon the tympan cylinder, the tympan cylinder having one portion adapted .for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; and mechanism for bringing the printing cylinders into and out oi printing relation to the tympan cylinder and operating to enable the printing cylinders to shift in directions that will avoid interference between themeshed gear teeth, there being means for so limiting the withdrawal of the printing cylinders from the tympan cylinder as to prevent the gear wheelsfrom becoming out of mesh, whereby the printing cylinders are maintained in proper relation the cylinders at proper relative speeds; and v mechanism whereby the printing cylinders may be moved in directions that will prevent interference between the meshed gear teeth in order to bring the printing cylinders into and out of printing relation with .the tympan cylinder, there being means for limiting the movements of the printing cylinders to prevent the operating gearing from becoming unmeshed.

5. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; and mechanism for readjusting the printing cylinders to maintain them substantially simultaneously in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adjustment, individual to but one printing cylinder.

6. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism for readjusting the printing cylinders to maintain them substantially simultaneously in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adjustment, individual to butone printing cylinder; and mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder.

7. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism for readjusting the printing cylinders to maintain them substantially simultaneously in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adj ustment, individual to but one printing cylinder; and mechanism for arbitrarily breaking'the printing relation between both printing cylinders and the tympan cylinder by one controlling operation when said printing cylinders are in substantially "simultaneous printing relation with the tympan cylinder.

8. A printing press including a tympan cylinder; a plurality of printing cylinders, thetympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and u another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism for readjusting the printing cylinders to maintain them substantially slmultaneously in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adustment, individual to but one printing cylinder; mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder; and mechanism controlling both printing cylinders for breaking and restablishing the printing relation between both printing cylinders and the tympan cylinder.

9. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted .for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism for readjusting the printing cylinders to -maintain them substantially simultaneouslv in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adjustment, individual to but, one printing cylinder; mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder; and mechanism common to the printing cylinders for arbitrarily breaking the printing relation between the same and the tympan cylinder when said printing cylinders are in substantially simultaneous printing relation with the tympan cylinder. 10. A printing press including a tympan tilt cylinder; a plurality of printing cylinders the. tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printin relation with the portion of the tympan cy inder individual thereto; and mechanism individual to each of the printing cylinders for arbitraril breaking the printing relation thereof w1th the tympan cylinder.

11. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alter nately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder; and mechanism common to the printing cylinders for also breaking the printing relation thereof with the tympan cylinder. 7 r

12. A printing press including a tympan cylinder: a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with the other vof the printing cylinders; mechanism for alternately bringing the rinting cylinders into printing relation wit the tympan cylinder in ar manner to confineeach printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; and mechanism common .to the printing cylinders for also breaking the printing relation thereof with the tympan cylinder.

. 13. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relationwith but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing: cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinmechanism for readjusting the printing cylinders to maintain them substantially-simultaneously in printing relation with the tyinpan cylinder whereby printing relation s established between each of the printing cylinders and the portions of the tympan cylinder that were, in the previous adjustment, individual to but one printing cylinder; and mechanism common to the printing cylinders for arbitrarily breaking the printing. relation thereof with the tympan cylinder.

14:. A printing press including a tympan cylinder; a plurality. of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism for alternately bringing the printing cylinders into printing relation with the tympan cylinder in a manner to confine each printing cylinder in printing relation with the portion of the tympan cylinder individual thereto; mechanism for readjusting the printing cylinders to maintain them substantially simultaneously in printing relation with the tympan cylinder whereby printing relation is established between each of the printing cylinders and the portions of the tympan cylinder that were each, in the previous adjustment, individual to but one printing cylinder; mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder; and mechanism common to the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder.

15. A printing press including a tympan cylinder; a plurality of printing. cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing re lation with but the other of the printing cylinders; and mechanism individual to each of' the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder.

16. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted. for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism individual to each of the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder; and mechanism common to the printing cylinders for arbitrarily breaking the printing relation thereof with the tympan cylinder.

17. A printing press including a tympan with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism whereby each printing cylinder is caused to co-act with the portion of the tympan cylinder to which it is individual; mechanism for maintaining both printing cylinders in printing position; and meansfor throwing either one of the two last-mentioned mechanisms into operation, at will.

19. A printing press including a tympan cylinder; a plurality of printing cylinders, the tympan cylinder having one portion adapted for individual printing relation with but one of the printing cylinders and another portion adapted for individual printing relation with but the other of the printing cylinders; mechanism whereby each printing cylinder is confined to printing relation with the portion of the tympan cylinder to which it is individual; and mechanism whereby each printing cylinder may be brought into printing relation with both of said tympan cylinder portions.

20. A printing press, comprising a tympan-cylinder having a plurality of impression surfaces, a plurality of printing-cylinders rotating in timed relation with the tympan cylinder, and means for effecting either alternate or simultaneous printing engagement between the printing cylinders and the v tympan cylinder.

21. A printing press, comprising a tympan cylinder having a plurality of impression surfaces and paper-securing devices corresponding therewith, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, and means for effecting relative bodily movement between the tympan cylinder and printing cylinders, timed to permit an impression surface to pass a printing cylinder Without printing engagement.

22. A printing press, comprising a tympan cylinder having a plurality of impression surfaces and associated work-securing devices, a plurality of printing cylinders rotating in timed relation withthe tympan cylinder, and means for periodically brealdng and restablishingthe printing relation bea means into use and the I will.

amass? tween the tympan-cylinder and the printingcylinders, in alternation.

23. A printing press, comprising a tympan-cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, and means for periodically moving the printing cylinders, in alternation, away from and toward the tympan cylinder,

24. A printing press, pan cylinder having a plurality of impression surfaces, a plurality of printing cylinders, means adapted to automatical y eflect relative bodily movement. between the tympan cylinder and printing cylinders, to permit an impression surface to pass a printing cylinder without printing engagement, means adapted to automatically maintain the printing cylinders ing relation with the tympan cylinder, and means within the control of the operator adapted to throw either of said automatic other into disuse, at

25. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders, automatic means adapted to efiect successive relative bodily movement between the tympan cylinder and the printing cylinders, timed to permit an impression surface to pass a printing cylinder without printing engagement, means individual to each of the printing cylinders for breaking the printing relation thereof with respect to the corresponding impression surface, means adapted to automatically maintain the printing cylinders in constant printing position with relation to the tympan cylinder, means for throwing either the alternate or the constant contact means into operation, at will, and means common to the printing cylinders for breaking the printing relation thereof with the tympan cylinder.

26. A printing press, pan cylinder divided to afford two impression surfaces, a pair of printing cylinders having one-half the diameter of the impression cylinder and disposed to contact with the impression cylinder ninety degrees from each other, said printing cylinders rotating in timed relation with the tympan cylinder, and means fpr efi'ecting either alternate or simultaneous printing engagement between the printing cylinders and the tympan cylinder.

27. A printing press, pan cylinder divided into two impression surfaces, a pair of printing cylinders of onehalf the diameter of the tympan cylinder and disposed ninety degrees apart, cylinderactuating mechanisms for moving the printing cylinders toward and away from the comprising a tymcomprising a tymtimed in constant print 7 comprising a tymtympan cylinder, and mechanism for actuating said cylinder-actuating mechanlsms in succession.

28. A printing. press, comprising a tympan cylinder divided into two impression surfaces, a pair of printing cylinders of onehalf the diameter of the tympan cylinder, cylinder-actuating mechanisms for moving the printing cylinders toward and away from the tympan cylinder, mechanism for actuating said cylinder-actuating mechanisms in succession, and tripping mechanism individual to each printing cylinder.

29. A printing press, comprising a tympan cylinder divided'into two impression surfaces, a pair of printing cylinders of onehalf the diameter of the tympan cylinder, cylinder-actuating mechanisms for moving the printing cylinders toward and away from the tympan cylinder, mechanism for actuating said cylinder-actuating mechanisms in succession, mechanism for maintaining both cylinder-actuating mechanisms in such position as to maintain both printing cylinders in their printing positions, and mechanism for throwing either of the two last-mentioned mechanisms into operation, at will.

30. Aprinting press, comprising a tympan cylinder divided into two impression surfaces, a pair of printing cylinders of onehalf the diameter of the tympan cylinder and disposed ninety degrees apart, cylinderactuating mechanisms for moving the printing cylinders toward and away from the tympan cylinder, mechanism for actuating said cylinder-actuating mechanisms in 'succession, mechanism for maintaining both' cylinder-actuating mechanisms in such position as to maintain both printing cylinders in their printing positions, mechanism for throwing either of the two last-mentioned mechanisms into operation, at will, and tripping mechanism common to and controlling both printing cylinders with relation to a given impression surface.

31. A printing press, comprising a tympan cylinder divided into two impression surfaces, a pair of printing cylinders of onehalf the diameter of the tympan cylinder, cylinder-actuating mechanisms for moving the printing cylinders toward and away from the tympan cylinder, mechanism for actuating said cylinder-actuating mechanisms in succession, mechanism for maintaining both cylinder-actuating mechanisms in such position as to maintain both printing cylinders in their printing positions, mech-, anism for throwing either of the two lastmentioned mechanisms into 'operation, at will, and atripping mechanism at each side of the tympan cylinder, one controlling the printing relation of both printing cylinders with respect to one impression surface and the other controlling the printing relation of both printing cylinders with respectto the other impression surface.

32. A printing press, comprising a tympan cylinder divided into two impression surfaces, a pair of feed devices c0-act1ng with said tympan cylinder, a pair of print-' ing cylinders of one-half the diameter of the means for throwing either of the mechanisms which actuate the cyhnder-shifting 'mechanisms into operation, at will.

33; A printing press, comprising a frame, a tympan cylinder having a pair of impression surfaces, a pair of printing cylinders of one-half the diameter of the tympan cylinder disposed below the tympan cylinder, a pairof transverse rock-shafts serving to shift the printing cylinders, mechanisms for actuating said rock-shafts in alternation to alternately raise and lower the printing cylinders, mechanisms for maintaining said rock-shafts in position to hold the printing cylinders in elevated position, and-means for throwing either of the two last-mentioned mechanisms into operation, at will.

34. A printing press, comprising a frame, a tympan cylinder having a pair of impression surfaces, a pair of printing cylinders of one-half the diameterof the tympan cylinder disposed below the tympan cylinder, a pair of transverse rock-shafts serving to shift the printing cylinders, mechanism for actuating said rock-shafts in alternation to alternately raise and lower the printing cylinders, mechanism for maintaining said rock-shafts in position to hold the printing cylinders in elevated position, means for throwing either of the two last-mentioned mechanisms into operation, at will, tripping mechanism individual to each printing cylinder, and two tripping mechanisms common to both printing cylinders, one of which controls both printing cylinders with relation to one impression surface, and the other of which controls both printing cylinders lifvith relation to the other impression surace.

35. A printing-press, comprising a tympan cylinder having two impression surfaces, a pair ofgprinting cylinders of onehalf the diameter, of the tympan cylinder and disposed beneath the tympan cylinder, a pair of rock-shafts adapted to elevate and depress the printing cylinders, a set of cams operatively connected with and adapted to oscillate said rock-shafts in alternation, a set of cams operatively connected with and adapted to maintain said rock-shafts in such position as to hold both printing cylinders in the printingposition, means for breaking the connections between said first-named set of cams and said rock-shafts, and means for throwing said second-named set of cams into operation. l

36. A printing press, comprising a tympan cylinder having two impression surfaces, a pair, of printing cylinders of onehalf the diameter of the tympan cylinder and disposed beneath the tympan cylinder, a pair of rock-shafts adapted to elevate and depress the printing cylinders, a set of cams operatively connected with and adapted to oscillate said rock-shafts in alternation, a set of cams operatively connected with and adapted to maintain said rock-shafts in such position as to hold both printing cylinders and a pair of tripping mechanisms common to both printing cylinders, one of which controls both printing cylinders with relation to one impression surface and the other of which controls both printing cylinders with relation to the other impression surface.

37. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, cylinder-shifting mechanisms for the printing cylinders, connecting rods serving to actuate the cylinder-shifting mechanisms, a set of cams adapted to reciprocate said connecting rods, and means for rendering said connecting rods inoperative with relation to the cylinder-shifting mechanisms.

3 8. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, cylinder-shifting mechanisms for the printing cylinders, connecting rods serving to actuate the cylinder-shifting mechanisms, a set of cams adapted to reciprocate said connecting rods, means for rendering said connecting rods inoperative with relation to the cylinder-shifting ,mechanisms, another "set of cams adaptedffo hold said connecting rods against reciprocation, and means for causlng either set of cams to control the connecting rods, at will.

, amass? 39. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, cylinder-shifting mechanisms for the printing cylinders, connecting rods serving to actuate the cylinder-shifting mecha nisms, a set of cams adapted to reciprocate said connecting rods, means for rendering said connecting rods inoperative with relation to the cylinder-shifting mechanisms, another set of cams adapted to hold said connecting rods against means for causing either set of cams to control the connecting rods, at will, tripping mechanism individual to each printing cylinder and operative when the first set ofcams is working, and tripping mechanisms common to the printing cylinders, each 'of which controls the printing cylinders with relation to a selected impression surface.

40. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, cylinder-shifting mechanisms for the printing cylinders, a set of connecting rods serving to actuate the cylinder-shifting mechanisms, a set of cams servingto oscillate said connecting rods in succession, a second set of cams adapted to maintain the connecting rods in position to maintain the printing cylinders in the printing position, means for causing either of said sets of cams to work, at will, means for breaking the operative relation between said cams and the cylinder-shifting mechanisms, trip mechanisms individual to the several printing cylinders and operative when the firstmentioned set of cams is working, a second set of connecting rods adapted to actuate the cylinder-shifting mechanisms in succession,

copies of this patent may he obtained for reciprocation,

a third set of cams adapted to actuate said second set of connecting rods in succession, means for throwing the third set of cams into operation, and a plurality of tripping mechanisms common to the printing cylin ders, each of which controls the relation of the printing cylinders with respect to a selected impression surface and is operat1ve to break the connection between the second-mentioned set of cams and the cylindershifting mechanisms.

41. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, a cylinder-shifting rock-shaft for each printing cylinder, a cam corresponding with each rock-shaft, a connecting-rod joining the cam to such rock-shaft,

and connecting-rod breaking-devices asso-- ciated with the connecting rods.

42. A printing press, comprising a tympan cylinder having a plurality of impression surfaces, a plurality of printing cylinders rotating in timed relation with the tympan cylinder, a cylinder-shifting rock-shaft for each printing cylinder, a cam corresponding with each rock-shaft, a connecting-rod joining the cam to such rock-shaft, connectingrod breaking-devices associated with the connecting rods, cam-actuated devices controlling the same, cams therefor, and means controlling the relation between said lastmentioned cams and the devices which they serve to actuate.

In witness whereof, I hereunto subscribe my name this fourth day of May A, D.,

WALLACE S. WARNOOK. Witnesses:

G. L. CRAoe, ETTA L. WHITE.

flve cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

